Chem 120 Lab Final Review Latest Update 2025- 2026 Questions and 100% Verified Correct Answers with Rationale Guaranteed A+
5 signs that indicate a chemical reaction has occurred - CORRECT ANSWER: color
change light gas formed heat turns cloudy
A 25 mL graduated cylinder in our lab is read to the nearest _____ mL. - CORRECT
ANSWER: 0.1
Actual yield=32g % yield= 80%
What is theoretical yield? - CORRECT ANSWER: 40g
Blue litmus paper turns______ in HCl - CORRECT ANSWER: red
Chemical or physical change...
- ice melting
- tearing paper
- moth ball disappearing
- burning candle
e) iodine evaporation - CORRECT ANSWER: a) physical
- physical 1 / 2
- physical
- chemical
- physical
Color of Br2 - CORRECT ANSWER: brown
Color of Cl-
Color of Br- - CORRECT ANSWER: colorless
colorless
Color of Cl2 - CORRECT ANSWER: yellow
Describe a "cool" flame. - CORRECT ANSWER: blue color, not very hot.
Dilute sodium hydroxide is found in a ____ bottle - CORRECT ANSWER: plastic
Draw the Lewis structure of 1-propanol and tell if H-bonding is possible. - CORRECT
ANSWER: Yes, h-bonding is possible.
CH3-CH2-CH2-OH
Mouth suction is never used. Use ________. - CORRECT ANSWER: pipet pump
Name 3 chemicals that need to be handled in fume hood - CORRECT ANSWER:
cyclohexane acetone methanol
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